School districts in Washington
49% of the 600 populated ZIP Code areas in Washington are served by more than one school district — 296 of them, which puts the state 27th among the fifty-two. It is organized into 295 unified districts, the largest being Seattle at 368,631 homes. Its most divided ZIP Code area, 98532, is split between 7 districts for elementary grades alone. The two districts that share the most ZIP Codes here are Puyallup and Franklin Pierce, in 5 of them. Counted by homes rather than by ZIP Code area, 61% of the state's housing sits in a ZIP Code that more than one district serves.
How often a ZIP Code here crosses a district line
The state is close to the national rate of 53%. Every count below comes from the census blocks in each ZIP Code area rather than from any published table; Seattle is the largest district in it, at 368,631 homes.
- ZIP Code areas with a district600
- Served by more than one district296 (49%)
- Grade school and high school differ0 (0%)
- No high school district named0
- Unified districts295
- Elementary districts0
- Secondary districts0
- Homes in no district at all0
The largest districts in Washington
Seattle dominates the state: at 368,631 homes it holds more than three times what Spokane does in second place. A district that size sets the answer for dozens of ZIP Code areas at once, and the areas it covers alone are counted on its own page rather than assumed from its size.
The most divided ZIP Code area in Washington
ZIP Code area 98532 holds 10,118 homes and 7 districts take a real share of them for the early grades, but Chehalis holds 63% on its own at that level. This is the shape that makes a single-name lookup look right: it names Chehalis and describes most of the homes here, and silently not the rest.
Each percentage here is a share of the 10,118 homes counted in ZIP Code 98532, not the chance that any one address is in that district. Enrollment follows the street: two houses on opposite sides of the same road can be in different districts, and only the district office can say which.
Every track below is 35 cells long and stands for all 10,118 homes counted in ZIP Code 98532, so one cell is 289 homes, rounded to the nearest whole cell. Cells lit solid are the homes one district holds, and the unlit cells are the homes held by the other districts in the same list.
- Chehalis School District6,329 of 10,118 homes63%
- Adna School District1,526 of 10,118 homes15%
- Napavine School District1,370 of 10,118 homes14%
- Pe Ell School District310 of 10,118 homes3.1%
- Onalaska School District252 of 10,118 homes2.5%
- Boistfort School District243 of 10,118 homes2.4%
- Centralia School District61 of 10,118 homes0.6%
One further district reaches into this area and holds 27 homes in it, under half a percent of the homes named at this level.
For grade school, an answer of one district name would be wrong for 3,789 of the 10,118 here.
How much of Washington a single district name misses
Across the 600 ZIP Code areas in Washington with homes in them, an answer of one district name misses 333,128 of the 3,202,260 homes they hold — 10% of the state. In 265 of those areas the single name is the whole truth; in the other 335 it is not.
In ZIP Code 98012 · Mill Creek, Washington the largest district for grade school is Everett, and naming it alone misses 11,403 of the 27,984 homes counted there. The rest are with Northshore and Edmonds.
In ZIP Code 98133 · Shoreline, Washington the largest district for grade school is Seattle, and naming it alone misses 10,251 of the 23,778 homes counted there. The rest are with Shoreline.
In ZIP Code 99208 · Spokane, Washington the largest district for grade school is Spokane, and naming it alone misses 9,159 of the 23,881 homes counted there. The rest are with Mead.
Where a ZIP Code here names more than one district
Of the 600 ZIP Code areas in Washington that the federal file names a district for, 296 name more than one school district. These are the 12 with the most, starting at 7 districts in one postal area: Chehalis, Sisco Heights and Mount Vernon. Each row opens the full answer for that ZIP Code, with every district named for grade school and for high school and the share of the homes each one holds.
- ZIP Code 98532 · Chehalis, Washington7 districts · 10,118 homes
- ZIP Code 98223 · Sisco Heights, Washington6 districts · 17,458 homes
- ZIP Code 98273 · Mount Vernon, Washington5 districts · 11,816 homes
- ZIP Code 98541 · Malone, Washington5 districts · 4,531 homes
- ZIP Code 98584 · Skokomish, Washington5 districts · 16,978 homes
- ZIP Code 98596 · Winlock, Washington5 districts · 2,780 homes
- ZIP Code 98935 · Grandview, Washington5 districts · 1,165 homes
- ZIP Code 99122 · Davenport, Washington5 districts · 2,264 homes
- ZIP Code 99170 · Rosalia, Washington5 districts · 502 homes
- ZIP Code 99217 · Spokane, Washington5 districts · 7,812 homes
- ZIP Code 99224 · Spokane, Washington5 districts · 10,328 homes
- ZIP Code 98077 · Cottage Lake, Washington4 districts · 4,716 homes
What to do next
Ask the district office to confirm your street address. A district settles that question on its own site: look for a school locator, a find my school tool, or an attendance zone map. Where there is none, ask the office itself.
A ZIP Code is a set of mail delivery routes, not a boundary: 296 of the 600 ZIP Code areas in Washington with a district named for them are served by more than one school district, and the line between two of them runs along streets. Only the district can say which side of that line an address is on.
This site links to no district website. None of the federal files it is built from publishes one, and a guessed address is worse than none. It is the district office, not a search engine, that settles an address.
If a house purchase depends on the answer, ask the district itself for written confirmation of that exact address. A listing is not a district record, and neither is this page.
What this cannot tell you
The homes were counted in the 2020 Census and the district lines are the 2026 boundary file. Nothing on this page adjusts one to the other. Where houses have been built or cleared since the count, a share here describes the place as it was counted rather than as it stands today, and in the fastest-growing ZIP Code areas that gap is the largest single source of error on this site.
A share on this page is a share of the homes in the ZIP Code area, not a probability for any particular address. Enrollment is decided by street address, and a district may run magnet, charter or choice programs that ignore the boundary entirely. If a decision depends on the answer, the district office is the only authority; this page shows what the federal boundary files say and when they were published.
A district boundary is not a school attendance zone. This site never says which school an address is assigned to: no current national dataset of attendance zones exists, and the district draws them itself. Nor is anything here endorsed or certified by the Census Bureau; we use their published files, and that is the whole of the relationship.
A ZIP Code is a set of mail delivery routes, not an area. What is mapped here is the Census Bureau's ZIP Code Tabulation Area, the closest published approximation to it. The two are not identical, and a handful of ZIP Codes used only for post office boxes or single buildings have no tabulation area at all.
Where these numbers come from
School district boundaries come from the Census Bureau's Census Geographic Relationship File, current 2026 vintage, which assigns every census block to a unified district or to an elementary and a secondary district. Homes and residents in each block come from the 2020 Census Redistricting Data (PL 94-171), H1_001 and P1_001. The ZIP Code areas come from the same Geographic Relationship File, block to ZIP Code Tabulation Area. District names and grade ranges come from the Census Gazetteer 2025, with 2020 for districts no longer listed.
The place name printed beside a ZIP Code comes from the Census 2020 ZIP Code Tabulation Area relationship files: place, county subdivision and county, taken 2026-09-06. It is a label rather than a measurement: the Census Bureau does not publish which post office a ZIP Code belongs to, so the place named is the one covering the most land inside the area, not the city the Postal Service prints on an envelope.
Everything else on this page — the shares, the counts of districts per ZIP, the comparison between the two grade bands, the rankings — is computed here from those files. The source publishes none of it. Snapshot taken 2026-09-03.